<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<style>
  .one {
    width: 100px;
    height: 100px;
    background-color: pink;
    float: left;
    margin-top: 50px;
  }
  .two {
    width: 200px;
    height: 200px;
    background-color: skyblue;
    float: left;
    margin: 0 auto;
  }
  .three {
    width: 300px;
    height: 300px;
    background-color: orange;
  }
</style>
<body>

<div class="one">one</div>
<div class="two">two</div>
<div class="three">three</div>

</body>
</html>
